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Eurasian Watermilfoil Myriophyllum spicatum By: Briana Betress. Native to: Europe, Asia, and North Africa First documented in 1942, confirmed in 45 states Introduced by Aquarium trade Spread mainly by boating activity as well as naturally

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Eurasian Watermilfoil

Myriophyllum spicatum

By: Briana Betress


  • Native to: Europe, Asia, and North Africa

  • First documented in 1942, confirmed in 45 states

  • Introduced by Aquarium trade

  • Spread mainly by boating activity as well as naturally

  • Habitat: Lakes, Ponds, Shallow Reservoirs, Low flow river and stream areas, brackish waters of protected tidal creeks and bays.

  • Especially abundant in areas of nutrient loading, intense plant management, or boat use.

  • Submersed, rooted, perennial herb

  • Whorled, finely divided leaves with leaflets in pairs of 14


Why eurasian watermilfoil is problematic
Why Eurasian Watermilfoil is Problematic

  • Ability to reproduce in fragments

  • High growth rate in a range of temperatures

  • Tolerant of a range of environmental conditions




Control Methods

  • Mechanical

    • Several cuts may be needed- like mowing your lawn

    • Dredging and rotavation can eliminate all plants

    • Mechanical harvesters are effective but costly

  • Chemical

    • May need to be repeated every 1-4 years

    • 2-4-D , used for dicots

  • Bio

    • Three taxa considered for use on Myriophyllum spicatum

      • Acentria ephemerella

      • Cricotopus myriophylli

      • Euhrychiopsis lecontei


Biocontrols
Biocontrols

  • Hydrilla tip mining midge-

  • Cricotopus myriophylli

  • Consumes meristem

  • Problems with mass rearing, and funding has slowed research

  • Milfoil Weevil-

  • Euhrychiopsis lecontei

  • Bores through stem, reducing buoyancy and carbohydrate storage capacity.

  • Pyralid Moth-

    Acentria ephemerella

  • Consumes meristem, stem, and leaves.

  • Unsure of host specificity


Biocontrol milfoil weevil
Biocontrol- Milfoil Weevil

  • Larvae are stem miners

  • Insectivorous fish may be decreasing weevil populations

  • Euhrychiopsis lecontei

  • 3mm in length

  • Completes all life stages submersed

Egg Larva Pupa Adult


Any Questions?

library.umf.maine.edu/plagiarism/credit2.html


References
References

  • http://www.forestryimages.org/images/384x256/0002004.jpg

  • http://plants.usda.gov/java/profile?symbol=MYSP2

  • library.umf.maine.edu/plagiarism/credit2.html

  • www.cnipm.org/images/Myriophyllum_spicatum.jpg

  • http://nas.er.usgs.gov/taxgroup/plants/docs/my_spica.html

  • http://www.hear.org/Pier/images/myspi12.jpg

  • http://fwcb.cfans.umn.edu/research/milfoil/milfoilbc/bcresearch.html

  • http://www.rcweeds.org/Weed_List/IMAG045.JPG


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